I use a light meter app on my phone and give sprouts 200-300 PPFD for 18-20 hours. If I want the plant to stretch more I will use less light but if I want to keep it more compact I will use more light. Then I gradually increase the light intensity to about 500 PPFD for veg. Then in flower I will run 600-900 PPFD depending on if it's a auto getting 18/20 hours of light or a photo getting 12 hours.